mt050 series dehydrator user manual

MT050 SERIESDEHYDRATOR

USER MANUALBulletin 237339 Rev: C

19 Sept 05

MT050 SERIES DEHYDRATOR USER MANUAL

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TABLE OF CONTENTSSECTION 1 General Information 3

Introduction 3Description 3Operation 4Triple Alarm Option 5Specifications 7

SECTION 2 Installation 8Unpacking and Inspection 8Controls and Displays 9Installing the Dehydrator 10Rack/Cabinet Mounting 10Wall Shelf Mounting 10Distribution Panel Mounting 10Power Connections 10AC Power 11Grounding Instructions 11DC Power 12Mounting 12Eletrical Connections 12DC Connector Assembly 12Operation 13Connecting Low Pressure Alarm Output 14Connecting Dehydrator to the Transmission Line 14Purging the Transmission Line 14

SECTION 3 Maintenance 15Regular Maintenance 15Preventive Maintenance 156000 Hour Overhaul 15Annual Maintenance 15Parts Replacement and Dehydrator Overhaul 17Dehydrator Compressor Overhaul 18Dehydrator Filter Element Replacement 20Service Restoration 21

SECTION 4 Troubleshooting 22Problem/Solution Table 22Compressor Schematic Diagram 23Schematic Diagram 24Alarm Diagram 25

SECTION 5 Replacement Parts 26

SECTION 6 Customer Service 26Warranty 29Declaration of Conformity 31

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General Information Section 1

1.1 Introduction

This manual contains the information you need toinstall, operate and maintain your MT050 SeriesDryLine® dehydrator. Please take the time to read thismanual before attempting to operate or service the unit.

1.2 Description

MT050 Series dehydrators provide dry air forpressurizing small (up to 20 cubic feet, or 560 liters, involume) antenna and transmission line systems. Thedehydrators produce -49ºF (-45ºC) dew point dry air atan output rate of 0.05 cubic feet (1.4 liters) per minute.

All MT050 dehydrators have a single output. Use theDP-4A-001 distribution panel, described below, foradditional output connections. Other distributionproducts, such as a MN6600, -M & -L Manifold or aMH-4B-001 Line Monitor may also be used to providemultiple outputs from a MT050 dehydrator.

The unit mounts in a standard 19" equipment rack or tothe top of the MT050 using supplied brackets. It comescomplete with an installation kit to connect up to fourindividual transmission lines.

Types MN6600 Series

The MN6600-Series of Two Manifolds, include one 3/8"output compression fitting, one gauge and one shutoffvalve per output. The unit mounts to the wall usingholes supplied through the manifold block.

Each dehydrator consists of an electrically-driven aircompressor, a membrane dryer assembly, an automatictransmission line pressure sensing system and a low-pressure alarm output housed in a rigid metal chassis.They are suitable for 19" rack mounting, wall mountingwith an optional shelf or free-standing applications.Their front panels feature a pressure gauge, anindicating on/off switch, a resettable circuit breaker, anda run time meter. For easy serviceability, powerconnections, alarm output connections and all filterelements are accessible from the front of the unit.

The MT050 maintains transmission line pressures at5.0 lb/in2 (34 kPa). It is intended for standardmicrowave antenna applications and any othertransmission line pressurization requirement thatsupports a relatively high pressure limit.

Type DP-4-001

The DP-4A-001 Four-Output Distribution Panel includesone 3/8" output compression fitting and one shut-offvalve per output.


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Each manifold comes complete with installationmaterials to connect two transmission lines.

Types MH-4B-001, MH-8B-001,MH-12B-001 and LM400 Series

MH-Series Four, Eight and Twelve Port Line Monitors,include one rear-panel 3/8" output compression fitting,one gauge, one flow meter and one shutoff valve peroutput.

The units mount on top of a dehydrator, in a 19" rack, tothe wall or stand free on a table or shelf using suppliedhardware. Each line monitor comes complete withinstallation materials to connect four, eight or twelvetransmission lines.

Low Pressure Options

The MT050 output is factory set at 5 psi (35kPa). If alower pressure is desired, a pressure regulator may beadded directly to the dehydrator output.

AE01A-D1339-001 Adjustable Pressure Wall MountRegulator is adjustable from 1 to 5 psi.

AE01A-D1339-002 Low Pressure Wall Mount Regulatoradjustable from 0.1 to 2.0 psi.

1.3 Operation

MT050 Theory of operation.

The MT050 series of DryLine® dehydrators, whilesimilar in moisture removal technology, operatesdifferently than the rest of the DryLine® series ofdehydrators. In order to provide a constant supply ofdry air to small air volume systems, and to maintain anacceptable moisture level in the product air stream, ahigh-pressure reservoir tank is needed. This reservoirtank is connected to a pressure regulator and orifice toyield a fixed output pressure of 5.0 psi and a nominalflow rate of 0.05 CFM. In addition to supplying theoutput air, the reservoir tank also provides the dry air forthe feedback loop. The feedback loop is necessary tomaintain the dryness of the membrane cartridge.

During normal operation, the bleed air in the feedbackloop will cause the pressure to drop in the internalreservoir tank, and the MT050 compressor will cycleautomatically. These cycles will take place regardlessof the system volume or condition of the transmissionline the dehydrator is connected to. The rate of thesecycles, however, will vary. During the purge cycle, thedehydrator will cycle approximately every 2 to 4minutes while showing 0 psi on the pressure gauge andproviding a constant 0.05 CFM of dry air.

When connected to a very tight system, or the output iscapped, the dehydrator will cycle approximately every60 to 90 minutes and maintain 5.0 psi system pressurewhile providing close to 0 CFM of dry air. A system thatleaks will have a cycle time somewhere in between,depending on the severity of the leaks.

The pressure gauge will also reflect a pressurebetween 0 and 5.0 psi while the output flow is between0.05 and 0 CFM. The pressure gauge senses pressurebeyond the flow control orifice and will show the actualpressure in the waveguide.

During the initial pressurization of the transmission line,the dehydrator will cycle every 2 to 4 minutes with thesystem at 0 psi pressure. As the dehydratorpressurizes the system, the cycle times will increaseuntil the dehydrator output is balanced with the systemleak, at which point the cycle times will stabilize.

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Figure 1

Figure 3

1.4 Alarm Options

This optional assembly is designed to provide theadditional Excess Run, High Humidity and Power Failalarms to Andrew Dehydrators. All alarms are Form Cdry contacts and are factory set for continuity at alarm.An additional High Pressure alarm is also available as aseparate option.

The external alarm monitoring system (not included) isconnected to the terminal strip located behind thecover. A small slotted screwdriver is necessary to makethe connections.

The connection to the alarm strip is as follows, andrefer to Figure 1 for correct locations and colors of thewires on the terminal strip.

Alarm Definitions

Power Fail P.F. (optional):Activates when power is removed from the dehydrator.This includes turning the power off at the switch.

High Humidity H.H.(optional):Activates when system or dehydrator output humidityrise above 7.5% relative humidity. At initial installation,this alarm will continue to alarm until the system hasbeen properly purged.

Excess Run X.R. (optional):User settable run time to be set in accordance with thenormal run time for the particular application.Selectable times are 10, 30, 120 and 240 minutes. SeeFigure 2 for location of JP3.

Low Pressure L.P. (standard):If system pressure falls below 1.0 PSI, the low-pressurealarm sensor will activate an alarm contact. This alarmis an indication of a significant system leak or adehydrator failure.

High Pressure H.P. (optional):If system pressure rises above 8.0 PSI, the low-pressure alarm sensor will activate an alarm contact.

Pressure Alarm Contact Arrangement


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Term. Function Wire Color NO Normal AlarmPower

1 Power Fail Com Black OFF ON OFF2 Power Fail Alarm Red3 Humidity Com Green OFF OFF ON4 Humidity Alarm Brown5 Excess Run Com Blue OFF OFF ON6 Excess Run Alarm White7 Low Press. Com. Grey ON OFF ON8 Low Press. Alarm Orange9 High Press. Com. Yellow OFF OFF ON

10 High Press. Alarm Purple

Figure 2

Changing Alarm Outputs:

ON = Conducting as factory setOFF = Non-conducting as factory set

JP2Power Selector InputAC - (A-B)DC - (B-C)

J4Humidity Sensor

JP1Compressor ExcessAlarm Timer (10 min.)

JP3Compressor VoltageTimer Set (120v)

J1Press. SwitchPS1

J7Term Block Connector

J2Press. SwitchPS2

JP5Aux (A-B) N.O.

JP6Low Press. (A-B) N.O.

JP7Power Alarm (B-C)N.C.

JP8Compressor Timer

JP9Humidity Alarm (A-B)N.O.


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Output Pressure

Constant 5.0 PSI

Output capacity 3.0 ft3/m (80 Iiters/h) total,approx. 0.05 ft3/m (1.5 liters/m)

Output Dew Point, -49°F (-45°C) or better

Operating Temperature Range +33° to +104° F (1° to +40° C)

Low Pressure Alarm 1.0 lb/in2 (6.9 kPa)

Electrical Input 115 VAC, 50/60 Hz230 VAC, 50/60 Hz21-29 or 42-60 VDC

Output Connector 3/8" polytube, compression

Dimensions 19” Rack, 7” (177.8 mm) Tall by 14” Deep (229 mm)

Optional Alarms

Power Fail Alarm loss of input power

High Humidity Alarm Set Point 7.5% RH, factory set

Excess Run Alarm Set Point 10 minutes, factory set

High Pressure Alarm 8.0 lb/in2 (55.2 kPa)

Sound Level 67dBA @ 1 meter

1.5 Specifications


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InstallationSection 2

2.1 Unpacking and Inspection

Open carton.

Remove the top piece of packing.

Carefully remove the installation accessories andmanual and dehydrator. Check the dehydrator forshipping damage such as dents or loose parts.

A. Remove front cover by pulling forward on thefour black snap-in fasteners.

B Then pull the cover forward and lift off the unit.Set the cover aside until inspection andinstallation are complete.

Check the inside of the dehydrator for damage.

Remove the top cover. Check for loose wires hoses orcomponents. If anything is loose, refer to thecomponent schematic and wiring diagram for properplacement. If you find any damage or if you needassistance for reconnection of wires or hoses, contactAndrew Customer Service Department at 1-800-255-1479. If everything looks correct, replace the top cover. Donot replace the dehydrator front panel at this time. It willbe replaced after the dehydrator is mounted andelectrical connections are complete.

A

B


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2.2 Controls and Displays

Familiarize yourself with the controls and displays priorto installing or testing the dehydrator.

Dehydrator Controls/Displays

Pressure Gauge - indicates dehydrator outputpressure in psi and kPa.

ON/OFF Switch - controls compressor and sensors.Light indicates power switch is ON.

Circuit Breaker - white tab indicates a circuit overload.Push to reset.

Hour Meter - provides a visual indication of thenumber of hours of compressor operation and providesvalidation for the 3000 hour warranty.


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2.3 Installing the Dehydrator

MT050 Series dehydrators are designed for lowvibration and low noise and can safely be placed in anexisting equipment rack or cabinet. They are alsosuitable for shelf mounting. Only minimal tools andhardware are required.

Allow at least 1-inch (25 mm) space on both sides ofthe chassis for air flow.

2.3.1 Rack/Cabinet Mounting

Movable brackets are included for mounting thedehydrator directly into a standard 19" (483 mm)equipment rack. Remove the rubber feet from thebottom of the dehydrator, if there is equipment directlybelow it in the equipment rack

Four #10-32 mounting screws are provided forattaching it to the rack.

Route electrical wiring and air line through the holes inthe rear and/or side of the chassis.

2.3.2 Wall Mounting

An optional shelf is available for wall mounting. A papermounting template is supplied with the shelf. Use it tomark mounting hole positions on a wall or plywoodbacker, as described below.

Masonry wall (concrete or cinder block), use concretescrews or screws with lead anchors or anchor bolts toattach the shelf or directly to the wall. Alternatively,install a plywood backer to the wall and mount the shelfto it.

2.3.3 Distribution Panel Mounting

The distribution panel mounts in a standard 19"equipment rack or directly to a dehydrator.

Rack mounting. Mount the panel directly above thedehydrator to simplify connections. Screws are providedin the cloth bag attached to the panel.

Mounting to dehydrator. Secure the distribution panel tothe top of the dehydrator, using brackets and screwssupplied in the cloth bag. Distribution panel should beflush with dehydrator face.

2.4 Power Connections

Confirm your dehydrator electrical input matches theavailable power.

Turn the power switch OFF. Locate the rectangular IECsocket behind the front cover (refer to Section 2.1).

115 VAC 24-60 VDC230 VACMT050-81015 MT050-81037MT050-81026MT050-81315 MT050-81337MT050-81326

MT050-81526


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CAUTION: Proper electrical connection isrequired. It is suggested a licensed electrician becontracted to connect the AC wiring to the unit, if itis connected directly to the mains. Failure toproperly connect the power wires could result in adangerous electrical shock hazard.

For equipment distributed to the 115 VAC NorthAmerican market, the AC power cord is terminated in amolded NEMA 5-15 plug. If the local AC required adifferent plug, cut off the mold plug and install anapproved type.

For equipment distributed in the 220 VAC internationalmarket, the supplied AC power cord is HAR/VDEapproved. It is not terminated with a plug, due to thelarge variety of plugs in use throughout the world.Install an approved plug at the end of the cord withstripped leads. The illustration shows two typical 220VAC plugs (Continental and British) for reference, butthey are not included with the cord.

2.4.1 AC Power

AC units can be connected into a standard 15 Amppower receptacle of the proper voltage. Make sure thepower circuit is properly grounded (see Section 2.4.3).

Verify the power switch is OFF. Locate the AC powercord that was supplied in the accessories bag. The cordplugs directly into the IEC socket. A strain-relief issupplied in the cloth bag. Install the strain relief firstand then connect the power cord.

2.4.2 Grounding Instructions

Ground the dehydrator to reduce the danger of electricshock.

AC units must be properly installed to meet localelectrical codes and ordinances.

AC powered units have a power ground stud located atthe right front of the chassis, inside the front cover.


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2.4.4 Mounting:

The inverter is designed for mounting directly to a wallsurface. Locate a wall surface in close proximity to theAndrew dehydrator suitable for supporting the inverter.

Mount the inverter to the wall using suitable wallanchors. Tighten screws.

Use the inverter wall drill template to locate and drill theinverter mounting holes.

Install screws in anchors (do not tighten completely)

2.4.5 Electrical Connections:

Caution: For safety reasons, externalfusing must be provided for the DCsupply.

The AC output is fused at the dehydrator by use of apanel mounted circuit breaker. Use DC supply cablecapable of carrying 300 watts of power for the requireddistance. Ensure that ground is connected correctly.The ground contact (PE) must be connected at the DCinput of the inverter, using the largest possible diameter.

Caution: Do not open the device!Some components inside carry highvoltages!DC Input Connector (Green, 3-pin):

1: PE (Earth Ground)2: +VDC3: -VDC

(left to right)Assemble supply cable to connector included toconnect DC power supply to the inverter.

Signal Connector (Green, 5-pin):Not used

AC Output Connector (Black, IEC style):1: Line2: PE (Earth Ground)3: Line (floating output)

(left to right)

2.4.6 DC Connector Assembly:

Insert stripped wires from DC Supply Cable into properpositions on 3-pin connector and tighten each screwterminal.

2.4.3 DC Power (optional)


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Before switching on the inverter, make sure that thefollowing conditions are met:

All External fusing is off.

The MAIN SWITCH is off.

Ensure proper polarity of all connections.

Ensure positive fastening of all connections.

Switch on the DC supply, then the AC unit.

2.4.7 Operation:

Press the push button (ON) on the front side of theinverter.

The inverter will start up, performing self tests.

The green LED (OK) will indicate proper functioning(AC output carries voltage).

-OR-

The red LED (FAULT) will blink to indicate a malfunctionTo reset the inverter after a failure, press the buttononce to acknowledge, and once again to switch theinverter on.

1 2 3 1 51

2

3

DCInput Signal

ACOutput

Attach strain relief to connector shell, clamping wire intoproper position.

Slide 3-pin connector into bottom half of outerconnector shell, routing wires through center of shell.

Assemble upper half of connector shell to complete theDC Supply Cable.

Use Power cable included to connect inverter todehydrator.


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Route the wires from the alarm control into the chassisand up the the terminal block.

Tighten the screws on the terminal block and replacethe front cover.

When a low pressure alarm condition exists drycontacts are activated at terminal block TB-1. An alarmcondition exists when pressure falls below 1.0 lb/in2

(6.9 kPa) for all MT050 models. The relay contacts arerated at 3 A (inductive), 30 VDC.

2.7 Connecting Dehydrator to the TransmissionLine.

Caution: Check the antenna and transmission linesystem pressure rating before connecting thedehydrator to the system. If the rating is below 5lb/in2 (35 kPa), select a LOW pressure regulatorsuch as AE01A-D1339-001 or AE01A-D1339-002 andconnect in the line between the dehydrator and thetransmission line.

Insert one end of the 3/8" polytube feed line tubing intothe compression fitting on the dehydrator inside wall, orone of the similar fittings on the DP-4A-001 DistributionPanel. Tighten securely with a 9/16" wrench. Becareful not to over tighten. Connect the other end of thepolytube to the transmission line.

Note: If the transmission lines have not beenpurged, continue with section 2.8. Otherwiseproceed to Section 3.

2.8 Purging the Transmission Line

Air in the transmission line system must be replacedwith dry air to ensure satisfactory operation of thetransmitted signal.

1. Determine the total system volume.

2. Divide the system volume by the flow rate of thedehydrator (3 CFH) to determine the number ofhours needed for the purge cycle

3. Open the far end of the transmission line.

4. Operate the dehydrator for three purge cycle.

If it is not possible to open the far end of thetransmission line:

1. Connect the dehydrator to the transmission lineand pressurize the system.

2. Wait 45 minutes while the air absorbs moisturein the system, then disconnect the dehy-dratorfrom the transmission line and allow the air tovent.

3. Repeat steps 1 and 2 three times to purge thesystem.

Optional alarms (if purchased) will also be located onthis terminal block. The alarm connection label,located inside of the front cover, will provide terminalnumbers for each additional alarm.

2.5 Connecting the Low Pressure Alarm Output.

To connect the low pressure alarm, remove the frontcover and locate the terminal block (TB1).


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MaintenanceSection 3

3.0 Maintenance

The MT050 Dehydrator requires relatively littlemaintenance to ensure satisfactory operation over longperiods of time. This section outlines the recommendedannual preventive maintenance for the unit and thesuggested overhaul for every 6000 hours of compressoroperation.

3.1 Regular Maintenance

The MT050 Dehydrator will perform at an optimum if it isroutinely checked for correct performance. Thischecking generally consists of an annual inspection ofthe condition of the air intake filter and an overhaul afterevery 6000 hours of compressor operation.Performance of these measures is sufficient to ensurecontinued reliable operation.

3.2 Preventive Maintenance

The annual maintenance of an MT050 consists of apreventative maintenance inspection of the dehydratorand cleaning (or replacement) of the foam air intakefilter.

The dehydrator overhaul kit includes parts to overhaulthe compressor and critical components in thedehydrator that often become worn over time.

These include replacement water filter elements withnew o-rings, and a length of white nylon tubing.

A compressor overhaul kit is also part of the dehydratoroverhaul kit.

This kit contains a new piston cup, along with newgaskets and screws.

IN CASE OF DIFFICULTY: If the dehydrator is notoperating, refer to the sections on installing andtroubleshooting the unit.

3.4 Annual Maintenance

Inspection includes checking for loose or damagedhoses, fittings and electrical connections. Remove thefront door (located on the right side of the dehydratorand held in place by four black plastic captive catches)and check the following items

These tasks can easily be performed in the field withthe unit connected to the transmission line system andwith only the front access door removed formaintenance.

3.3 6000 Hour Overhaul

A Hour Meter is provided on the front of the MT050 toindicate the actual number of hours the compressorinside the dehydrator has run.


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Check the water filter and coalescing filterelements

Verify that there is no water build-up in the two filterbowls located inside the front cover of the dehydrator.There may be some droplets of water vapor in the filterbowls (the lower portion of each bowl), but there shouldbe no noticeable amount of liquid in either bowl.

Check the electrical connections.

Check the IEC socket to ensure that the AC power cordis securely plugged in. Check the screw-in alarmterminals to ensure that all wire connections are tight.

Check the ground wire

Check that an electrical safety ground is installed onthe stud inside the front cover of the dehydrator. Thisconnection point is located on the far right portion ofthe bottom of the dehydrator chassis. (It is intended tobe customer installed in the field).

If there is excessive water, refer to the troubleshootingsection. Replacement of the filter elements in the waterfilter and coalescing filter is covered in the overhaulsection of this manual.

Check the Hour Meter

Check the Hour Meter on the front panel to determinethe duty cycle of the dehydrator.

If the dehydrator has been running for more than 10-15% of its installed time, check the system for leaks.Also check the time on the meter to determine if it istime to perform the 6000-hour overhaul.

A loose or damaged connection may result in erraticoperation and unnecessary downtime. Refer to thetroubleshooting section if an electrical problem isencountered.


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A ballpoint pen, an adjustable open-end wrench, asocket wrench with a 7/16-inch (or 11mm) socket, aNo. 2 Phillips screwdriver and a small flat-bladescrewdriver.

Overhaul Procedure

When the MT050 compressor run time reaches 6000hours (or a multiple of 6000 hours) it is time to replacecertain items in the compressor and the air path of thedehydrator. These include the piston cups, pistonseals and head gaskets of the compressor, the filterelements in the water and coalescing filters and thetube/grommet section connecting the compressoroutput to the water filter input.

Unit Shutdown and Removal

In order to perform an overhaul on the MT050, the unitmust be turned off and removed from service. As this

is being done the low pressure alarm may activatethrough a reporting alarm system. Personnelmonitoring such an alarm should be notified in advanceso that they are aware of the fact that service is beingperformed. It is also necessary to disconnect thedehydrator dry air output from the waveguide systemduring the overhaul. Use the shutoff valves provided inthe distribution panel, manifold or line monitor to closeoff the waveguide inputs and preserve pressure duringthe maintenance operation.

If the single-line shutoff valve supplied with thedehydrator installation kit was installed, close this valveas well to further isolate the waveguide system.

Remove the cover from the right front of the dehydratorto expose the maintenance access area.

Disconnect the alarm wiring, tagging the leads so thatthey may be correctly reconnected later.

3.5 Parts Replacement and Dehydrator Overhaul

Andrew MT050 Dehydrators are designed to give mayyears of trouble-free service and require very minimalmaintenance. The dehydrator contains, as a standardfeature, a Hour Meter that records compressor runhours. To ensure continuous and reliable operation, thedehydrator must be overhauled every 6000 hours ofcompressor operation. The kit listed below, contains allof the necessary parts to perform this overhaul.

Maintenance Parts

1. Dehydrator Overhaul Kit 1 ea.AE01K-C0398-007Gast / Domnick HunterAE01K-C0398-014Thomas / Domnick HunterAE01K-C0398-016Gast / Parker(current production)

2. Compressor Air Intake Filter bag of 6, EFLTR-91101

Tools

The following tools are used in the maintenance andoverhaul procedures.

Once the notification and isolation steps have beenperformed, turn off the front panel switch on the MT050and disconnect the dehydrator from the AC mains.

Finally, if the dehydrator is rack mounted, remove thescrews holding the unit in place on the rack.

Cover Removal:

CAUTION: Disconnect electrical power from theMT050 before removing the top cover. HazardousAC voltages are exposed with the cover removed.

Remove the rack mounting ear from the left side of thedehydrator cover. The rack mounting ear on the rightside can be left on the cover with only the bottomscrew removed.

3.6 Dehydrator Compressor Overhaul

(There are four on each side and five on the top of thecover.)

Pull the cover straight forward from the lower chassisand it will be free to lift off.

Loosen the dry air output line connection from thedehydrator and leave it free to slide through the accesschannel on the right side of the chassis.

Next remove the remaining 13 machine-screw setsfrom the cover.

Remove the three bolts securing the compressorpressure head.

Remove the pressure head and valve plate.


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Remove piston sleeve. Be careful not to damage anyof the shims when removing the piston sleeve.

Remove the two screws securing the piston retainerplate and cup. Discard the old cup, retainer, screwsand both gaskets.

Add all shims included in the kit (some kits may nothave shims) to the original stack and replace the pistonsleeve.

Install the new piston cup by aligning the holes withthose in the piston and pushing it into the pistonsleeve.

Install the new retainer inside piston cup and securewith new screws. Use a locking aid to secure thescrews in the piston.

Install new gasket between valve plate and head.

Replace the valve plate and pressure head. Tightenbolts.

Install new gasket between cylinder and valve plate.


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Repeat this procedure for the vacuum head. Use theoriginal retainer plate.

Reconnect the dehydrator to AC Power source.

Turn the dehydrator on and verify the solenoid remainsclosed while the compressor is running and openswhen the compressor shuts off.

Check the compressor head, filter bowl assembly andtubing connections for leaks.

Check compressor cycle time. Compressor should runfor approximately 90 seconds after the initial cycle.

Allow dehydrator to run for a minimum of 1 hour beforereturning to service.

Replace the top and front covers and return thedehydrator to service.

3.7 Dehydrator Filter Element Replacement

Clean/replace the air intake filter

The air intake filter protects the compressor fromcontamination and dust. Periodic cleaning /replacement extends the life of the compressor.

The filter is made of open-cell foam material. It shouldbe cleaned or replaced once a year (or more frequently,if the operating environment is very dusty.)

Pull off the filter cover and remove the foam element.(The cover is held in place by two tabs. Use a smallscrewdriver or a ballpoint pen to release them.)

Wash the filter in running water, squeezing it betweenthe fingers.

Squeeze and shake out any excess water and returnthe element to the filter housing.

(Caution: Do not apply oil or otherchemicals to the filter element.)

Make sure the element is seated completely in thehousing and then replace the cover. If a new elementis used, discard the old element.


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A Unscrew both plastic bowls from the filter bowlassembly. Leave tubing attached (bottomfittings swivel to allow bowl removal).

B Remove both filter elements by unscrewing theelement. Install new elements by screwing thenew element into the filter assembly. Refit thebowls to the filter assembles.

3.8 Service Restoration

RECOMMENDATION:

If the dehydrator overhaul process has taken more thana few hours, it is recommended that the unit be run forone hour into the room, to purge the membrane dryerand tank of any acquired moisture, before reconnectingto the transmission line system.

Reverse the steps followed initially to remount thedehydrator on its rack or shelf; to reconnect the dry airlines; to reconnect the power and alarm cabling; to turnthe unit back on; and finally, to open the valves to thewaveguide system so that the dehydrator is againproviding dry air under pressure to the transmission linesystem.

Coalescing filter element replacement

B

A


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TroubleshootingSection 4If you experience difficulty with your dehydrator, use the troubleshooting procedures described below.

Caution: Electrical troubleshooting requires access to potentially dangerous voltages and should only be performed by a licensed electrician.

Dehydrator on/off switch does not light, unit does notrun.

Check the breaker adjacent to the on/off switch. If the breakeris tripped, (white indicator exposed) then reset the breaker.If the on/off switch light still falls to light, make sure the unit isplugged in and power outlet is operating.

If you still have no light, unplug the unit, remove the unit coverand check for loose connections. Refer to the wiring diagramfor proper connections.

Dehydrator on/off switch does not light, unit runs.

Disconnect power, remove cover, check for loose connectionsper the wiring diagram. Replace cover and reconnect inputpower.

If condition persists, replace on/off switch.

Pressurize lines with the dehydrator, turn shut-off valve to theoff position and observe pressure gauge. The pressure gaugeshould read approximately 5.0 psi and the alarm should clear.If alarm does not clear, remove cover and verify wiring to lowpressure alarm switch.

Low-pressure alarm activated.

If the pressure does not stay constant after shutting off thevalve, apply leak detector to isolate the leak in the dehydrator(exercise care when applying solution not to wet wiring orelectronics).

With dehydrator isolated from transmission line, observepressure in transmission line. If pressure drops, use a leakdetector solution to locate leaks in the transmission line.Repair leaks if possible.

SolutionProblem/Condition

Compressor does not turn.

If the problem persists contact Andrew Customer Service.

Check the breaker adjacent to the on/off switch. If the breakeris tripped, (white indicator exposed) then reset the breaker.

Check power switch to make sure that it is on and lighted.

Check input power polarity and voltage per wiring diagram.

Circuit breaker tripped.Check wiring connections per wiring diagram. If breaker tripsagain, replaces the breaker. If the replacement breaker tripscontact Andrew Customer Service.

Assure that the drain line tubing (exiting the bottom of the unit)is not clogged. When the compressor cycles off, air andmoisture should flow out of the drain line.

Filter bowls show excessive water.


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230 VAC

B1COMP

WHTORN

RED E11E12

E10

BLK

BRN

BRNC1

7.5 MFD

GRN/YEL

GND

VAC./COMP. MOTOR230 VAC CONNECTION DIAGRAM

CAPACITOR C1 INCLUDED WITH MOTOR

E1

BLU

(-XXX26, -XXX9X)

B1COMP

E8

E7

C1

E1

115 VAC

WHTORN

BRN

GRN/YEL

GND

VAC./COMP. MOTOR115 VAC CONNECTION DIAGRAM

CAPACITOR C1 INCLUDED WITH MOTOR

(-XXX1X, -XXX3X)

E9

BRN

WHT

REDBLUBLK BLK

7.5 MFD

Compressor Schematic Diagram


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CO

MP

RES

SOR

CO

NN

EC

TOR

BLK

(-XX3

XX, -

XX5

XXO

NLY

)

WH

T(-X

X3XX

, -X

X5XX

ON

LY)

AC P

OW

ERO

UTP

UT-

115V

AC

DC

TO

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GND

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25

WHITE66

RED22

BLACK1 1

BROWN

GREEN

44

3 3

5 BLUE5

YELLOW

ORANGE88

7 GRAY7

9 9

PURPLE10TB1

10

BLACKREDGREENBROWN

GRAYWHITE

ORANGEYELLOWPURPLE

BLUE

LOWPRESSURE

SWITCH3 AND 5ALARM

ORANGEN/C

GRYCOMMON

HIGHPRESSURE

SWITCH5 ALARM(ONLY)

GRYCOMMON

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Alarm Cables

L.P. ALARM - GRAY

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6

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3 and 5 Alarm (option)

Standard Low Pressure Alarm


26

Replacement Parts Section 5

The following is a list of the replacement parts for theMT050 series dehydrators:

Description

Compressor AE01J-A0713-001Inlet Filter EFLTR-20201Pressure Gauge AE01J-A0128-001Valve, Over-Pressure AE01J-A0174-007Circuit Breaker EBREK-10376ON/OFF Switch (115V) AE01J-A0129-005ON/OFF Switch (230V) AE01J-A0129-006LP Alarm Switch AE01J-A0734-010Compressor Control Switch AE01J-A0731-001MT050-8XXXX AE01J-A0127-0043-Alarm Board AE01J-B0845-101RH Alarm Sensor Cable AE01C-D0785-001Front Door Fastener Kit AE01K-D0818-020Rubber Feet (bag of 4) AE01K-D0818-040

Customer Service Section 6

6.0 Introduction

Andrew provides in-warranty and out-of-warrantyrepairs as well as dehydrator and compressoroverhauls from several Repair Centers. Coordinationof these services is provided through the nearest SalesOffice or Customer Service Center. The Center is alsoprepared to help you with the following:

Technical AssistanceTroubleshooting RepairsLoaner UnitsSpare PartsInstallation MaterialsSystem Accessories.

6.1 In Case of Trouble

The first step you should take if trouble develops usinga dehydrator is to read the operators manual and followthe trouble isolating procedures given in it.

If the steps in the manual do not identify and remedythe problem, then contact an Andrew Customer ServiceCenter for 24-hour telephone assistance. Record theModel Number (e.g. MT050) and Serial Number fromthe product label, as you will be asked for these whenyou call. Two main locations are currently available tohelp:

in North America ---1-800-255-1479

in Europe ---+44 1592 782612

any Location (to USA)(708) 349-3300

Gast Compressor/Dominick Hunter Filter

Overhaul Kit AE01K-C0398-007

Filter Element (1.0 micron) EFLTA-91060Filter Element (0.01 micron) EFLTA-91050Bowl Only EFLTA-83000

(Filter bowl assy AE01J-A1978-050 can be used as areplacement for Dominick Hunter filter bowl assy.)

Gast Compressor/Parker Filter

Overhaul Kit AE01K-C0398-016

Filter Element (1.0 micron) AE01J-A1978-202Filter Element (0.01 micron) AE01J-A1978-201Bowl Only AE01J-A1978-101Filter Bowl Assy AE01J-A1978-050


27

If you find it easier to describe your troubles by Fax,then the following numbers are also available:

in North America ---1-800-349-5444 (Fax only)

in Europe ---+44 1592 782380 (Fax only)

any Location (to USA)(708) 349-5410 (Fax only)

6.2 Initial Steps by Andrew

When your call or fax communication is received, theAndrew staff will work with you to pinpoint the possiblecause of trouble. If the pressurization equipment issuspect, they will:

* ask for your unit Model Number and SerialNumber

* check the warranty status of the unit

* advise the availability of a loaner unit

* provide an estimate of the cost for inspectionand repairs, if the unit is out-of-warranty

* fax a Return Goods Authorization Sheet to you.

6.3 Return Goods Instructions

After you have contacted Andrew and received aReturn Goods Authorization Number (RGN), you willneed to take the following steps to send the faulty unitto a Repair Center:

* make a copy of the Return GoodsAuthorization Sheet that was faxed to you

* write a brief description of the trouble you areencountering and attach this to the copy of thesheet

* pack the unit (with at least 4-inches ofprotective packaging on all sides)

* enclose the authorization sheet and troubledescription within the box

* mark the outside of the box with the RGN

* return the box to the Repair Center addresslisted on the authorization sheet.

If you have saved the original packaging that camewith the unit, use it to return the dehydrator for repair.

If a loaner unit (of the same type) was supplied byAndrew, use the loaner unit box to return the originaldehydrator

6.4 Repair Center Process

The Andrew Dehydrator Repair Center will receive yourunit and inspect it for any transport damage. The unitwill then be analyzed for troubles using the descriptionyou have supplied and the specialized experience theCenter staff have with dehydrators.

If the unit is in-warranty, repairs are made at no chargeand the unit will be returned to you by the same modeof transport as it was received.

If the unit is in-warranty, but no problems are found, theunit will be thoroughly tested before being returned toyou. A nominal inspection fee will be charged for thisservice.

If your unit is out-of-warranty, it will be inspected andyou will be advised of the estimated cost of repairs,before the Center proceeds with any work. You mayelect to scrap the unit or accept the estimated chargefor repairs. If you elect to scrap the unit, you will bebilled the nominal inspection fee. If you elect repairs,you will be billed for the inspection fee, parts consumedand labor necessary to do the repair.

6.5 Loaner Units

The Andrew dehydrator Repair Centers stock a limitednumber of "loaner" dehydrator units of both current anddiscontinued products. These units, while not new, arestill in excellent working order.

Loaners are available on a first-come first-served basis.They are issued in conjunction with the original RGNand are invoiced at a nominal price. You will need torequest a second RGN to return the loaner unit. Acredit memo is issued by the Repair Center when aloaner is returned


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29



30

DECLARATION OF CONFORMITY

Application of Council Directives 73/23/EEC; 89/336/EEC

Standards to Which Conformity is Declared EN60204-1; EN50082-1-1992

Manufacturer's Name ANDREW CORPORATION

Manufacturer's Address 2601 TELECOM PARKWAYRICHARDSON, TEXAS 75082 USA

Authorized Agent AAS - ANDREW LIMITED

Agent's Address THE AVENUELOCHGELLY, FIFESCOTLAND, UNITED KINGDOM, KY5 9HG

Type of Equipment DEHYDRATION

Model Number MR050, MRS050, MT050, ODPMT200, PMT200

I the undersigned, hereby declare that the equipment specified above conforms to the above Directive(s) and Standards.

Place: Richardson, Texas, USA(Signature)

Date: February 25, 2002 John Curry(Full Name)

Product Line Manager(Position)

AE01B-A0409-001 Rev: F




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mt050 series dehydrator user manual

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